Improvement in processes of annealing cast-iron skates



UNITED STATES PATENT" OFFICE.

OLIVER EDWARDS, OF FLORENCE, MASSACHUSETTS.

IMPROVEMENT IN PROCESSES O F ANNEALING CAST-IRONYSKATES.

Specification forming part of Letters Patent No. 177,628, dated May 23,1876 application filed March 16, 1876. a

To all whom it may concern:

Be it known that I, OLIVER. EDWARDS, of Florence, in the countyofllampshire and State of Massachusetts, haveiuvented certain new anduseful Improvements in Skates; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as .willenable others skilled in the art to which it pertains to make and useit, reference 'bein g had to the accompanying drawings, which form partof this specification.

"--In'the manufactureofska tes it is desirable to turn out an articlepossessing great toughness, malleability, and a capacity to temper, asis seen in steel, but one that can be obtained ata cost of productionless than that when made of said expensive material.

Heretofore a cheap skate has been run out as an iron casting, butwith'all the disadvantages attendant upon. such a construction;-

also, steel runners have been made, but, from the initial cost of theraw material, they have been of comparatively heavy cost.

My-inventionrelates tothe process of manufacturing skates orskate-runners, having as its object the obviation of the above-mentioneddisabilities and objections incident to both of I the manufacturesreferred to 5 and it consists in the process ofannealing iron castingsof skates while embedded in a packing of mag:

surrounded by, magnetic oxide of iron, to

which maybe added a mixture of the black oxide of manganese. After beingproperly prepared, the same as in packing casting for annealing, andhermetically sealed, the castings are subjected to the action of ananneal; in g-oven, being there heated by a temperature which willproduce a light-red color on the casting-chambers. They are then allowedto gradually waste their heat as the oven cools slowly until lowered tothe proper degree, as is well understood in annealing, when. they may beremoved: -From nve'to seve'n'days 1 have usually held as sufiicieutjtime.

Upon taking the skate out from the packing it will be found to be tough,malleable, and, in general, resembling in itschara'cteristics ordinarysteel; 7

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The process of manufacturing malleable cast-iron skates, sameconsisting in annealing the cast-iron skate, packed in magnetic oxide ofiron, substantially as and for the purpose specified.

2. The process of manufacturing malleable cast-iron skates, sameconsisting in annealing the cast-iron skate, packed in magnetic oxide ofiron, with an admixture of black oxide of manganese, substantially asand for the pur pose described.

3; As a new article of manufacture, a malleable cast-iron skate,substantially as and for the purpose set forth.

' In testimony that I claim the foregoing I have hereunto set my handthis 8th day of March, 1876.

OLIVER EDWARDS. Witnesses:

Trros. B. HALL, MELVIN H. STEARNS.

